Master of Geography-What is the relationship between monsoon climate and westerly wind in Yunnan?

Yunnan monsoon climate belongs to tropical monsoon climate, and its cause of formation is the same as that of south subtropical monsoon, which is caused by the difference of thermal properties of sea routes. That is, the Yunnan summer monsoon is mainly the southeast trade wind in the southern hemisphere, and the geostrophic deflection across the equator to the north becomes the southwest wind, which is the Yunnan summer monsoon. Note: This southwest wind comes from the humid air mass in the Indian Ocean, so it is rainy in Yunnan in summer.